[Serusers] can't connect to RPT proxy

Hi all ! My ser.cfg (ser-0.8.12) is very similar like nathelper.cfg I run rtpproxy as ./rtpproxy -l IPaddress. On this same interface is ser binded Communication between ser and rtpproxy is via /var/run/rtpproxy.sock Why I'm not able to connect with rtpproxy ? I have: Dec 4 19:48:45 /usr/sbin/ser[19200]: ERROR: extract_mediaip: no `c=' in SDP Dec 4 19:48:45 /usr/sbin/ser[19200]: ERROR: send_rtpp_command: can't connect to RTP proxy Dec 4 19:48:45 /usr/sbin/ser[19200]: ERROR: extract_mediaip: no `c=' in SDP Dec 4 19:48:45 /usr/sbin/ser[19200]: ERROR: send_rtpp_command: can't connect to RTP proxy Dec 4 19:48:45 /usr/sbin/ser[19208]: WARNING: check_content_type: Content-TYPE header absent!let's assume the content is text/plain ;-) Dec 4 19:48:45 /usr/sbin/ser[19208]: ERROR: on_reply processing failed Regards Andrzej